Visiting site of First Opium War (1840 -1842)

To answer a question from reader of Clare Street, Penny Chang: the most memorable and meaningful site I visited during my recent tour in Guangdong was undoubtedly the seaside battlefield of the First Opium War (1840-1842) at Dongguan's Humen (or Tiger Gate) Town. I still remember that one of the examination questions of History of Modern China, a subject which I took in Melbourne's Monash High School for the Victorian Higher School Certificate (VHSC) in 1982, was on " (T)he causes and repercussions of the First Opium War ".